64 
THE DIPTERA OP THE BRISTOL DISTRICT. 
Syrphus cinctellus (Zett.) Cheddar, sometimes common in August. 
ductus (Fin.) Stroud (Wainwright). 
,, auricollis (Mg.) S.M. and Freshford, August, and V.R.P. 
triangulifer (Zett.) Stroud (Bradley). 
,, punctulatus (Verr.) Stroud (Wainwright). 
umbellatarum (F.) S.M. and Cheddar, September, and 
C.J.W., rare. 
,, compositarum (Verr.) Cheddar, August, rare. 
,, labiatarum (Verr.) Batheaston (Blathwayt). I have taken 
it in North Devon. 
Sphcei'ophoria scripta (L.) Common everywhere. 
,, menthrasti (L.) S.M., sometimes common. 
,, Jlavicauda (Zett.) Bristol, August, rare. 
Xanthogramma ornatum (Mg.) S.M., sometimes common. 
,, citrofasciatum (Deg.) Very rare, Redland, on pop- 
pies, and V.R.P. 
Baccha obscuripennis (Mg.) S.M., June. 
,, elongata (F.) Leigh Woods and Purdown. 
Sphegina clunipes (Fin.) Rare, S.M., June, and V.R.P. 
Ascia podagrica (F.) Common everywhere. 
,, dispar (Mg.) Rare, Redland, May. 
Brachyopa bicolor (Fin.) Very rare, Bitton in May, and V.R.P. 
Rhingia rostrata (L.) Very common everywhere. 
Volucella. Large and beautiful flies resembling humble-bees. 
V. inanis resembles a wasp, in whose nests the larvae live. The 
males are fine hoverers. 
Volucella bombylans (L.) Fairly common in district. Resembles 
Bombus lapidarius. 
,, var. plumata. Fairly common, resembles Bombus terrestris. 
,, inflata (F.) S.M., June, very rare ; also V.R.P. 
,, inanis (L.) Somersetshire in considerable numbers 
(Verrall). 
,, pellucens (L.) S.M., Cheddar, Bristol. Sometimes com- 
mon. 
Eristalis. 'Drone Flies,' bee-like and fine hoverers. Larvae are 
' rat-tailed,' and live in mud and water. 
Eristalis intricarius (L.) Stapleton, July, rare. 
,, var-furvus, S.M., July, rare. 
,, tenax (L. ) Very common everywhere. 
,, sepulchralis (L.) Very rare, Horfield, and S.M., August, 
and V.R.P. 
,, arbustorum (L.) Common everywhere. Several varieties 
occur, the commonest variety of the male' being one that 
has white edges to the abdominal segments, and no 
yellow spots. 
pertinax (Scop.) Common everywhere, one variety has 
clear wings, another clouded wings. 
,, nemorum (L.) Rare, Cheddar, July, and V. R.P. Recogniz- 
able by the dark front tarsi. 
